A text book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained (1849)
tchcircle on which the width of the teeth and spaces must be laiddown. Then with a radius D. E or D. F^ equal to a pitch anda fourth, from the middle of each tooth on the pitch circle as at D,describe the tops of the teeth E and Fy from 0 describe the topsof the teeth G and D, and so on for the… … Plate 35. TEETH OE WHEELS
